Side brush



FIG. 1 is a front elevation view of a side brush;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof, the left side being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top perspective view thereof; and,

FIG. 7 is a bottom perspective view thereof.

The broken lines show portions of the side brush that form no part of the claimed design. 

CLAIM The ornamental design for a side brush, as shown and described. 